Chapter 9. Distributed Logging and Tracing

When breaking down a monolith into microservices, we usually spend a lot of time thinking about business boundaries or the partitioning of our application logic, but we forget about the logs. From my own experience as a developer and software architect, I can say that developers do not usually pay much attention to logging. On the other hand, operation teams, which are responsible for application maintenance, are mainly dependent on logs. Regardless of one's area of expertise, it is indisputable that logging is something that all applications have to do, whether they have monolithic or microservices architecture.However, microservices force adding a whole new dimension to design and arrangement of application logs. There are many small, independent, horizontally scaled, intercommunicating services that are running on multiple machines. Requests are often processed by multiple services. We have to correlate these requests and store all the logs in...